Their OLED is more concerned with getting accurate colours. Whilst Samsung's OLED tends to ramp up the contrast to get that "WOW" look, Apple is freaking concerned with ideal color reproduction.
I paired my friends iPhone 7 next to mine iPhone X. The iPhone X had freaking amazing color reproduction, the 7 seemed a bit washed out. maybe because i had true tone on which gives the X more pop
I paired my mother's iPhone 8 next to mine iPhone X. To me both colors are freaking similar that they look eerily similar to some extent. But I understand why Apple went for accurate color reproduction instead of overblown vibrancy/contrast/saturation like samsung's actual oled in thier flagships. They want people to have a consistent experience, where Samsung has much room to tweak and boot.
Which is why the OLED looks almost the same as the 8/8 Plus side by side. The only differences are most likely going to be (1) the deep blacks are true black, LCD will exhibit some greying to some extent due to the backlight. (2) maybe (?) WHITES? i don't know. but the blacks are usually the differentiator that sets OLED best over LCD => higher contrast ratio
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Did you get rid of your s8? I am deciding between the s8 and the X. Price wise, s8 makes more sense, but refinement of apple may be worth the price.
I have used my friend's S8 for a week and it's snappy and quite close to iPhone's OS altho not extensively fluid like iOS normally is, but is getting better. Unless you're sunk in the ecosystem I think both phones will work fine pick your priorities. The X may be steep in price for some which I'll be honest, but I hope if you do choose the X, at least use it for a long time [3-5 years or so], then at least the price might be worthwhile if you can stretch it that far.
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maybe you need 25 degrees to enjoy the full blue experience, true. and as you say, that's not how people usually use an iphone. my problem is that slight but clearly visible change between yellowish and whiteish even at the slightest movement of the phone. looking straight at the screen: yellow. 1 degree movement: turning more whiteish. 2 degrees: even more whiteish. like a really bad lcd screen from a low end anroid phone. as an iphone user for 9 years, that's a huge step down from the quality that I'm used to.
I think that situation is way too overblown with the blue hues... It's perfectly fine characteristic of OLED display.
If want exact color accuracy without much color shift, you need IPS LCD => iPhone 8/8+ since those have a wider viewing angle without much shift.
The shift in color might be due to the pentile matrix of the OLED display characteristic.